Page:Lowell Hydraulic Experiments, 4th edition.djvu/80

 removed, consequently the passive resistance arising from the friction of the step, was much greater than in the other experiments.

108. Fig. 6, plate VII., is a diagram representing the experiments; the abscissas represent the ratios of the velocities of the exterior circumference of the wheel, to the velocities due to the falls acting upon the wheel, as given in column 14, of table V.; the ordinates represent the ratios of the useful effects to the powers expended, as given in column 11; the points, representing experiments 12 and 13, are connected by a broken line, because the latter experiment is not strictly comparable with the others, in consequence of the removal of the counterbalance.

109. The following table contains the successive steps of the calculation for the ordinates of the path of the water in experiment 3, represented at figure 4, plate VII; the operations are all similar to those explained in articles 83 and 119. The ordinates in column 10 are obtained by the formula $$O = {{R' \omega AH} \over {Q''}}$$ in which